let addr=['长沙','株洲','湘潭','岳阳','常德','衡阳','郴州','永州'];
for(var i=0;i<addr.length;i++){
    console.log(addr);
  
}
for(var i in i++){
    console.log(addr)
}
    for(var i of addr){
        console.log(addr)
    } 
